Beatriz Pereira de Alvim
Beatriz Pereira de Alvim was a Portuguese noblewoman, the only child of Nuno Álvares Pereira and his wife Leonor de Alvim.
On 8 November 1401, she married Afonso I, [Duke of Braganza|Afonso, Count of Barcelos], illegitimate son of king John I of Portugal. She died before her husband became Duke of Braganza.
Afonso and Beatriz had three children.
- Afonso of Braganza, 4th Count of Ourém and 1st Marquis of Valença, had a natural son from Dona Brites de Sousa. His issue took the name de Portugal
- Isabella of Braganza, married her uncle Infante John, Lord of Reguengos, son of John I of Portugal
- Ferdinand I, Duke of Braganza, succeeded his father as second Duke of Braganza